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Acne is common enough that most people meet it, and the pharmacy shelf answers it with plants: tea tree oil, green tea, herbal creams, capsules of something a leaflet calls purifying. Patients ask whether any of it works. The honest answer is that it depends on the plant, the preparation and the dose, and the trials that could settle it have never been read together. They do not agree on much. Some test a single herb, some a mixture, some an essential oil, some one isolated compound. Some give it by mouth, some on the skin. The comparison might be a placebo, a plain cream, or a treatment already in use. Most count spots, though not always the same kind, and many leave out the botanical detail a pharmacist would need in order to know what was actually given: the species, the plant part, the solvent, whether anything was standardised. A striking result is worth little if nobody can say what produced it. This review reads that literature one kind of preparation at a time, and asks of every trial what its result can honestly be attached to. The first thing anybody does here is read.
Read up on acne and on how plant preparations are made and tested. Take one group of preparations, read the trials that report on it, build the table that goes with it, and write that section of the review.
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